disk wipe : My old 486sx AMI bios lost its storred information 3 times. No floppy,no hard disk, a real bum twitcher.After 5 minutes of sheer panic I went into setup and saw what hadhappened, I re-entered settings from the hard disk manual and allworked. I then made notes of settings and stuck them on the box.My dx100 did the same last month and this has an Award bios, fortunatelythis also has an auto detect, which it did and all was well.Setup is sometimes entered by pressing 'Delete' as the computer bootsup.Hope this helps.But it could also be that the CMOS battery is dead and that means she wouldto configure these settings every time she starts up the computer or buy anew one (that is a new battery) disk wipe : You will get this in the case of Hardware failure, obviously, but youcan also get this for other reasons. The CMOS information could havebeen wiped, in which case you can go into the CMOS, and redetect, orif it's an older board, you'll have to reenter parameters manually.Alternatively, DOS will be unable to mount a hard disk if thepartition table on the disk has been corrupted. A reasonable test forthis is to boot from a floppy, and run Norton DiskEdit. Go to selectdrives, and switch it to physical, as opposed to logical mode. If youcan then see the hard disk, then the hardware will be ok. As for thedata - thats another story.You should be aware that there are certain viruses that can play thiskind of trick - the monkey virus will encrypt the partition sector ofa hard disk, and make it unrecognizable if the machine is booted froma floppy. If a machine gets this, it will continue to boot from thehard disk though, but if you're unlucky enough to pick up a secondbootsector virus, this will frequently cause a machine to stopbooting. It's comparatively rare, but I have seen it happen, and acrashed hard disk is also fairly rare, so I'd check out allpossibilities first. Good virus scanners (F-Prot, Doc Sols) are awareof such 'unreadable' hard disks, and can clean them using low leveldisk IO, meaning you can boot from a floppy, and run them, even thoughthe hard disk is inaccessible. disk wipe : It's true what you said Mike. I had a master boot virus that stopped mymachine dead cold. Everytime I tried to boot up with anything, I keptgetting an error message that this version of DOS was incompatible. I endedup formatting drive C. But I found out later that this command would haveworked had I used it immediately at the first sign of trouble:FDISK\MBRHas anyone ever used this command and did it work? I have had no problemssince formatting, but don't want to do that again. Thanks.I have used this extensively at work when getting rid of boot sectorviruses.I have also used it to get rid of custom boot loaders like linux etc. Be very careful - it isn't 100% successful and could trash your HD. I havehad a couple of machines fall down after using this. disk wipe : FDISK /mbr refreshes the code in the master boot record of a harddisk. It is not a 'virus aware' program, it simply overwites whateverwas in master boot sector.Imagine a virus which has encrypted the first few cylinders of yourHD, just enough to get the root directory and both copies of the FAT.Furthermore, this virus decrypts them in memory, while it is active.You have a PC which looks fine when booted from the hard disk, but hasa virus in memory. When booted from a floppy, you can't access thehard disk. If you then run fdisk /mbr, you're left with a clean harddisk, but you root directory and FATS are encrypted, and if the virusstored the decryption key in the MBR you just overwrote, it's goodbyedata. FDISK /mbr can be used successfully, and has been used, but youshould obly attempt it if you know what virus you have, what it does,and appreciate the implications of what you're going to do. Generallyspeaking, it's much better to use a good AV, such as Dr Sols, orF-Prot. These programs know about viruses, and can take theappropriate steps to disinfect without destroying data - fdisk isdependent on the user knowing _exactly_ what they're doing. disk wipe : This is exactly what happened to the computer I use at work. It had avirus named NBW in the boot record, which McAfee found (booting from aclean floppy) and destroyed, ha-ha-ha. Now the controlpanel|system|performance tab doesn't show a changed MBR, but it stillshows c: in MS-DOS compatability mode. I've replaced the controller,which had rust(!) radiating from the parallel ports, I've reformattedand reinstalled, I've searched every applicable hardware vendor's site,and I've burned a stick or two on incense over it. Nothing works. Anyonehave any ideas how I can get this running at speed? The drive is aQuantum 512MB, and LBA is enabled in the BIOS. TIA,It is usually best to use a good anti-virus program to remove a virus.If you don't mind losing your data, then you can do FDISK\MBR, butthat's like using a club to kill a fly.
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